What is meant by effective apperture in antena?

The term "effective aperture" describes how well the physical aperture is utilized in allowing electromagentic radiation to pass into space. Effective Aperture = eta x Physical Aperture, where eta is a number that can't be greater than 1.
The effective aperture value can get close to the physical aperture value for antennas where aperture illimination is good, ie small physical aperture slots. The effective aperture value can also be pretty small compared to the physcial aperture in aperture antennas like parabolics with poor aperture illumination.

The answers post by the user, for information only, FunQA.com does not guarantee the right.

More Questions and Answers:
  • How does silver casting works?
  • Whats the difference between flooded and non flooded shell and tube type of evaporators?
  • Who would win in a fight between SpiderMan and Hong Kong Phooey?
  • Any one know how to make a handphone charger using a 12 volt battery ?
  • Why stones are laid along with the surface railway track?
  • Do you want to hover?
  • I want to buy low viscosity epoxy resin for to use as concrete coating. Can someone help.?
  • Describe how the flue gas analysis would vary and the implications for energy efficiency if:?
  • OK i put a light bulb in the mocrowave...?
  • Do you have a copy of nfpa701 flame retardant specifications?